CN113027421A - Nuclear magnetic resonance logging T2 spectrum form correction method in oil-based drilling fluid environment - Google Patents
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Abstract
The invention relates to the field of oil and gas field exploration and development and discloses a nuclear magnetic resonance logging T2 spectrum form correction method in an oil-based drilling fluid environment. On the basis of nuclear magnetic resonance logging data actually measured in the existing water-based drilling fluid environment and the oil-based drilling fluid environment, a functional relation between nuclear magnetic resonance logging T2 spectrums in the oil-based drilling fluid environment and the water-based drilling fluid environment is established, the nuclear magnetic resonance logging T2 spectrum form in the oil-based drilling fluid environment is corrected, the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment can be corrected to the nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment with corresponding depth, fluid identification is carried out, the purposes of accurately calculating rock physical characteristic parameters and evaluating a reservoir pore structure are achieved, the corrected result is beneficial to continuous quantitative evaluation of the rock pore structure and permeability according to the nuclear magnetic resonance logging T2 spectrum, and the accuracy of nuclear magnetic resonance logging data application in the oil-based drilling fluid environment is improved.
Description
Technical Field
The invention relates to the field of oil and gas field exploration and development, in particular to a nuclear magnetic resonance logging T2 spectrum form correction method in an oil-based drilling fluid environment.
Background
Nmr logging enables the evaluation of various petrophysical properties of a reservoir, including lithology-independent parameters such as total porosity, permeability, effective porosity, irreducible water saturation, etc., and also the evaluation of the pore structure of the reservoir.
The radial depth of nuclear magnetic resonance logging detection is shallow, and the flushing zone area is mainly detected, so that the measured nuclear magnetic resonance logging T2 spectrum contains information of drilling fluid filtrate. In the environment of water-based drilling fluid, the main component of the drilling fluid filtrate is water, a water-wet phase is dominant in a nuclear magnetic resonance logging detection range, and at the moment, the nuclear magnetic resonance logging T2 spectrum distribution form is basically not influenced by the water-based drilling fluid filtrate, so that the method can be used for calculating the physical parameters of the reservoir rock and evaluating the pore structure, wherein long relaxation time represents large pores, and short relaxation time represents small pores. However, in the environment of the oil-based drilling fluid, the fluid invading into the detection range of the nmr logging is mainly oil-based drilling fluid filtrate, and is a non-wetting phase fluid for rock particles, and at this time, the volume relaxation of the oil-based drilling fluid filtrate of the non-wetting phase is not negligible, so that the amplitude and the form of the nmr logging T2 spectrum are obviously changed compared with the nmr logging T2 spectrum in the environment of the water-based drilling fluid. For the oil-based drilling fluid with the main component of light hydrocarbon, the phenomenon that the spectrum shape of the nuclear magnetic resonance logging T2 is seriously trailing to the right due to the invasion of the filtrate of the oil-based drilling fluid in the nuclear magnetic resonance logging can cause a large-pore false image, and the calculation result of the permeability is large. At this time, the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment cannot be directly used for reservoir evaluation.
Disclosure of Invention
Based on the above problems, the invention aims to provide a nuclear magnetic resonance logging T2 spectrum form correction method in an oil-based drilling fluid environment, the correction result is helpful for continuously and quantitatively evaluating the calculation of the rock pore structure and permeability according to a nuclear magnetic resonance logging T2 spectrum, and the application accuracy of nuclear magnetic resonance logging data in the oil-based drilling fluid environment is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a nuclear magnetic resonance logging T2 spectrum morphology correction method under an oil-based drilling fluid environment comprises the following steps:
s1, respectively and actually measuring nuclear magnetic resonance logging data of a reservoir layer of a target area in a water-based drilling fluid environment and an oil-based drilling fluid environment, and processing to obtain a nuclear magnetic resonance logging T2 spectrum, a corresponding permeability curve and a corresponding porosity curve in the corresponding environment;
s2, dividing reservoirs into multiple types according to the permeability curve and the porosity curve, capturing actual measured nuclear magnetic resonance logging data of the reservoirs of each type under the water-based drilling fluid environment and the oil-based drilling fluid environment respectively by adopting a two-dimensional grid method, and establishing a functional relation between a nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment and a nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment;
s3, correcting the nuclear magnetic resonance logging T2 spectrum of each type of reservoir in the oil-based drilling fluid environment to the water-based drilling fluid environment, and further utilizing the corrected nuclear magnetic resonance logging T2 spectrum to continuously and quantitatively evaluate the calculation of the pore size and the permeability of the reservoir in the oil-based drilling fluid environment.
As a preferable scheme of the nuclear magnetic resonance logging T2 spectrum form correction method under the oil-based drilling fluid environment, the types of reservoirs are divided into four types, the permeability K of the I type reservoir is within a value range of K <1mD, the permeability K of the II type reservoir is within a value range of K <10mD > to K <1mD > to K <10mD, the permeability K of the III type reservoir is within a value range of K <100mD > to K <10mD, and the permeability K of the IV type reservoir is within a value range of K being more than or equal to 100 mD.
The method is a preferable scheme of the nuclear magnetic resonance logging T2 spectrum form correction method under the environment of the oil-based drilling fluid, the upper limit and the lower limit of the porosity and the permeability of a reservoir layer are determined, the porosity and the permeability are divided into a plurality of equal parts between the upper limit and the lower limit, the porosity is used as a horizontal coordinate, the permeability is used as a vertical coordinate, a two-dimensional grid is obtained, nuclear magnetic resonance logging T2 spectrum data under the environment of the oil-based drilling fluid and the environment of the water-based drilling fluid are divided into corresponding grid units point by point according to the pore permeability value, and a nuclear magnetic resonance logging T2 spectrum sample library under the environment of the water-based drilling fluid and the environment of the oil-based drilling fluid is formed respectively.
As a preferable scheme of the method for correcting the nuclear magnetic resonance logging T2 spectrum form in the oil-based drilling fluid environment, a nuclear magnetic resonance experiment and a high-pressure mercury intrusion experiment in a saturated water state are carried out on a core sample of each type of reservoir, and a plurality of T2 relaxation times corresponding to pore size distribution with the largest influence of each type of reservoir on permeability are obtained.
As a preferred scheme of the nuclear magnetic resonance logging T2 spectrum form correction method under the oil-based drilling fluid environment, 5T 2 relaxation times are selected, and 5T 2 relaxation times given by a type I reservoir are respectively 1.5ms, 3.0ms, 10.0ms, 30.0ms and 50.0 ms; class II reservoirs were given 5T 2 relaxation times of 4.0ms, 10.0ms, 40.0ms, 60.0ms, 100.0ms, respectively; class III reservoirs were given 5T 2 relaxation times of 10.0ms, 40.0ms, 90.0ms, 220.0ms, 310.0ms, respectively; the 5T 2 relaxation times given for the type iv reservoir are 50.0ms, 120.0ms, 250.0ms, 410.0ms, 1000.0ms, respectively.
As a preferable scheme of the method for correcting the nuclear magnetic resonance logging T2 spectrum form in the oil-based drilling fluid environment, the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment is divided into 6 intervals by 5T 2 relaxation times, the minimum T2 relaxation time T2min and the maximum T2 relaxation time T2max which are given by each type of reservoir, the amplitudes of the nuclear magnetic resonance logging T2 spectrum in each interval are accumulated, the proportion of the pore components in different intervals to the total pore components is calculated, and 6 porosity X components are obtained.
As a preferred scheme of the method for correcting the nuclear magnetic resonance logging T2 spectrum form in the oil-based drilling fluid environment, a multivariate linear function relation between the amplitudes of each point of the nuclear magnetic resonance logging T2 spectrum composition in the water-based drilling fluid environment and 6 porosity X components of the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment is established, and the nuclear magnetic resonance logging T2 spectrum amplitudes in the water-based drilling fluid environment at different T2 relaxation times are calculated from the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment.
As a preferred scheme of the method for correcting the spectrum form of the nuclear magnetic resonance logging T2 in the oil-based drilling fluid environment, the multivariate linear function relation between the amplitude of each point of the nuclear magnetic resonance logging T2 spectrum composition in the water-based drilling fluid environment and 6 porosity X components of the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment is as follows:
A1＝a11X1+a12X2+a13X3+a14X4+a15X5+a16X6+b1
A2＝a21X1+a22X2+a23X3+a24X4+a25X5+a26X6+b2
A3＝a31X1+a32X2+a33X3+a34X4+a35X5+a36X6+b3
...
Ai＝ai1X1+ai2X2+ai3X3+ai4X4+ai5X5+ai6X6+bi
in the above formula, AiThe amplitude value corresponding to the ith distribution point of the corrected nuclear magnetic resonance logging T2 spectrum is shown, and the value of i is the distribution point number of the nuclear magnetic resonance logging T2 spectrum; x1,X2......X66 porosity X components partitioned for corresponding reservoir types; a isi1,ai2......ai6The coefficient corresponding to the multivariate linear function corresponding to the ith point is obtained by calibrating the nuclear magnetic resonance logging T2 spectrum data under the water-based drilling fluid environment and the oil-based drilling fluid environment in the sample library; b1,b2......biConstant coefficients corresponding to the multivariate linear function corresponding to the ith point distribution, wherein the numerical values of the constant coefficients are nuclear magnetism under the water-based drilling fluid environment and the oil-based drilling fluid environment in the sample libraryAnd calibrating the resonance logging T2 spectrum data.
As a preferred scheme of the nuclear magnetic resonance logging T2 spectrum form correction method under the oil-based drilling fluid environment, a nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment after correction is drawn according to the calculated nuclear magnetic resonance logging T2 spectrum amplitude and the corresponding T2 relaxation time.
As a preferable scheme of the nuclear magnetic resonance logging T2 spectrum form correction method under the oil-based drilling fluid environment, a comprehensive interpretation chart is drawn in a logging interpretation platform according to the nuclear magnetic resonance logging T2 spectrum under the corrected water-based drilling fluid environment.
The invention has the beneficial effects that:
the invention provides a nuclear magnetic resonance logging T2 spectrum form correction method under the environment of oil-based drilling fluid, which comprises the steps of firstly, respectively and practically measuring the nuclear magnetic resonance logging data of a reservoir layer of a target area under the environment of water-based drilling fluid and the environment of oil-based drilling fluid, and processing to obtain the nuclear magnetic resonance logging T2 spectrum and a corresponding permeability curve and porosity curve under the corresponding environment, then, dividing the reservoir layer into a plurality of types according to the permeability curve and the porosity curve, respectively capturing the nuclear magnetic resonance logging data which are practically measured under the environment of water-based drilling fluid and the environment of oil-based drilling fluid by adopting a two-dimensional grid method for each type of reservoir layer, establishing the functional relation between the nuclear magnetic resonance logging T2 spectrum under the environment of oil-based drilling fluid and the nuclear magnetic resonance logging T2 spectrum under the environment of water-based drilling fluid, and finally correcting the nuclear magnetic resonance logging T2 spectrum of each type of reservoir layer under the environment of oil-based, and then calculating the pore size and permeability of the reservoir layer under the oil-based drilling fluid environment by utilizing the corrected nuclear magnetic resonance logging T2 spectrum. The invention provides a method for correcting the nuclear magnetic resonance logging T2 spectrum form under the environment of oil-based drilling fluid, which establishes the functional relationship between the nuclear magnetic resonance logging T2 spectra under the environment of oil-based drilling fluid and the environment of water-based drilling fluid on the basis of the nuclear magnetic resonance logging data actually measured under the environment of the existing water-based drilling fluid and the environment of oil-based drilling fluid, corrects the nuclear magnetic resonance logging T2 spectrum form under the environment of oil-based drilling fluid, can correct the nuclear magnetic resonance logging T2 spectrum under the environment of oil-based drilling fluid to the nuclear magnetic resonance logging T2 spectrum under the environment of water-based drilling fluid with corresponding depth, carries out fluid identification, realizes the purposes of accurately calculating the physical characteristic parameters of rocks and evaluating the pore structure of a reservoir stratum, solves the problems that the nuclear magnetic resonance logging T2 spectrum form is obviously changed due to the invasion of oil-based drilling fluid, and the pore structure of the rock cannot be, the correction result is helpful for continuous quantitative evaluation of the pore structure and permeability of the rock according to the T2 spectrum of the nuclear magnetic resonance logging, and the application accuracy of the nuclear magnetic resonance logging data in the oil-based drilling fluid environment is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for correcting a nuclear magnetic resonance logging T2 spectrum form in an oil-based drilling fluid environment according to an embodiment of the present invention;
fig. 2 is a comprehensive explanatory diagram of nmr logging in an environment of water-based drilling fluid in the method for correcting the nmr logging T2 spectrum morphology in an environment of oil-based drilling fluid according to the embodiment of the present invention;
fig. 3 is a comprehensive explanatory diagram of nmr logging in an oil-based drilling fluid environment in the method for correcting the nmr logging T2 spectrum morphology in the oil-based drilling fluid environment according to the embodiment of the present invention;
fig. 4 is a schematic diagram of a nuclear magnetic resonance logging T2 spectrum extracted by a two-dimensional grid method in a nuclear magnetic resonance logging T2 spectrum form correction method under an oil-based drilling fluid environment according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a measured NMR log T2 spectrum of a NMR log from a type I reservoir under different drilling fluid types in a NMR log T2 spectrum morphology correction method in an oil-based drilling fluid environment according to an embodiment of the invention;
FIG. 6 is a schematic diagram of a measured NMR log T2 spectrum of a NMR log from a type II reservoir under different drilling fluid types in a NMR log T2 spectrum morphology correction method in an oil-based drilling fluid environment according to an embodiment of the invention;
FIG. 7 is a schematic diagram of a measured NMR log T2 spectrum of a NMR log from a type III reservoir at different drilling fluid types under drilling conditions in a NMR log T2 spectrum morphology correction method in an oil-based drilling fluid environment according to an embodiment of the invention;
FIG. 8 is a schematic diagram of a measured NMR log T2 spectrum of a NMR logging tool of different types of fluids extracted from a type IV reservoir under different drilling conditions in a NMR logging T2 spectrum morphology correction method in an oil-based drilling fluid environment according to an embodiment of the invention;
fig. 9 is a comprehensive explanatory diagram of a nuclear magnetic resonance logging T2 spectrum in a water-based drilling fluid environment, which is obtained by correcting a nuclear magnetic resonance logging T2 spectrum actually measured in an oil-based drilling fluid environment in the nuclear magnetic resonance logging T2 spectrum morphology correction method in the oil-based drilling fluid environment according to the embodiment of the present invention;
fig. 10 is a diagram for verifying the accuracy of a method for calculating permeability by using a nuclear magnetic resonance logging T2 spectrum in a water-based drilling fluid environment, which is obtained after correction, in a nuclear magnetic resonance logging T2 spectrum form correction method in an oil-based drilling fluid environment according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a method for correcting a T2 spectrum form of nmr logging in an oil-based drilling fluid environment, where the method for correcting a T2 spectrum form of nmr logging in an oil-based drilling fluid environment includes the following steps:
s1, respectively and actually measuring nuclear magnetic resonance logging data of a reservoir layer of a target area in a water-based drilling fluid environment and an oil-based drilling fluid environment, and processing to obtain a nuclear magnetic resonance logging T2 spectrum, a corresponding permeability curve and a corresponding porosity curve in the corresponding environment;
s2, dividing reservoirs into multiple types according to the permeability curve and the porosity curve, capturing actual measured nuclear magnetic resonance logging data of the reservoirs of each type under the water-based drilling fluid environment and the oil-based drilling fluid environment respectively by adopting a two-dimensional grid method, and establishing a functional relation between a nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment and a nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment;
s3, correcting the nuclear magnetic resonance logging T2 spectrum of each type of reservoir in the oil-based drilling fluid environment to the water-based drilling fluid environment, and further utilizing the corrected nuclear magnetic resonance logging T2 spectrum to continuously and quantitatively evaluate the calculation of the pore size and the permeability of the reservoir in the oil-based drilling fluid environment.
On the basis of the nuclear magnetic resonance logging data actually measured in the existing water-based drilling fluid environment and the oil-based drilling fluid environment, the functional relationship between the nuclear magnetic resonance logging T2 spectra in the oil-based drilling fluid environment and the water-based drilling fluid environment is established, the nuclear magnetic resonance logging T2 spectrum morphology in the oil-based drilling fluid environment is corrected, the nuclear magnetic resonance logging T2 spectrum in the oil-based drilling fluid environment can be corrected to the nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment with corresponding depth, fluid identification is carried out, the aims of accurately calculating the rock physical characteristic parameters and evaluating the pore structure of a reservoir layer are fulfilled, the problems that the nuclear magnetic resonance logging T2 spectrum morphology is obviously changed due to invasion of oil-based drilling fluid filtrate, the rock pore structure cannot be accurately and quantitatively evaluated, and the evaluation parameters of the reservoir layer cannot be accurately and quantitatively evaluated are solved, the correction result is favorable for the calculation of continuously and quantitatively evaluating the rock pore structure, the accuracy of the nuclear magnetic resonance logging data application in the oil-based drilling fluid environment is improved.
Taking measured nuclear magnetic resonance logging data of a certain oil and gas field as an example, acquiring core data of a target area and actually measured nuclear magnetic resonance logging data of a water-based drilling fluid well (namely, under the water-based drilling fluid environment) and an oil-based drilling fluid well (namely, under the oil-based drilling fluid environment), and performing data processing on the collected nuclear magnetic resonance logging data through a CIFLOG (common information flow field) interpretation platform to respectively obtain logging comprehensive interpretation charts under two drilling conditions, as shown in fig. 2 and fig. 3. It should be noted that, in fig. 2 and 3, the first trace is GR (natural gamma curve), CAL (borehole diameter curve), and BIT (drill diameter curve), the second trace is depth trace, the third trace is resistivity curve, the fourth trace is three-porosity curve, the fifth trace is measured nmr log T2 spectrum before correction, the sixth trace is nuclear magnetic calculated porosity and core analysis porosity contrast trace, the seventh trace is nuclear magnetic calculated permeability contrast trace before and after correction, and the eighth trace is lithological profile. As can be seen from fig. 3, for the oil-based drilling fluid with the main component of light hydrocarbons, invasion of the oil-based drilling fluid filtrate by nmr logging causes severe tailing of the spectrum shape of the nmr logging T2 to the right, which causes a large pore artifact, and the calculated permeability is large.
Optionally, the types of the reservoirs are divided into four types, the permeability K of the reservoir in the type I is in a range of K <1mD, the permeability K of the reservoir in the type II is in a range of K <10mD and is not more than 1mD, the permeability K of the reservoir in the type III is in a range of K <100mD and is not more than 10mD, and the permeability K of the reservoir in the type IV is in a range of K > 100 mD.
Because the permeability determines the seepage capability of the reservoir, the invasion degree of the oil-based drilling fluid filtrate into the reservoir is also determined, and the stratum fluids in stratum invasion zones with different permeabilities are displaced by the oil-based drilling fluid filtrate to different degrees, so that the corresponding characteristic difference of the NMR logging T2 spectrum under different invasion states is obvious, and the reservoir needs to be classified according to the permeability value.
Optionally, determining the upper limit and the lower limit of the porosity and the permeability of the reservoir, dividing the porosity and the permeability between the upper limit and the lower limit into a plurality of equal parts, taking the porosity as a horizontal coordinate and the permeability as a vertical coordinate to obtain a two-dimensional grid, dividing the nuclear magnetic resonance logging T2 spectrum data under the oil-based drilling fluid environment and the water-based drilling fluid environment into corresponding grid units point by point according to the pore permeability value, and respectively forming a nuclear magnetic resonance logging T2 spectrum sample library under the water-based drilling fluid environment and the oil-based drilling fluid environment.
A nuclear magnetic resonance logging T2 spectrum sample library of a research area is constructed by utilizing a two-dimensional grid technology, the porosity is used as an abscissa, the permeability is used as an ordinate, and statistical analysis shows that the lower limit of the porosity of a reservoir layer of the research area is 6%, the upper limit of the porosity is 25%, the lower limit of the permeability is 0.01mD, and the upper limit of the porosity is 1000 mD. As shown in fig. 4, the two parameters are divided into 1000 equal parts between the upper and lower limits, thus obtaining 1000 × 1000 grids, each corresponding to a range of porosity and permeability. Dividing the nuclear magnetic resonance logging T2 spectrum data under the oil-based drilling fluid environment and the water-based drilling fluid environment into corresponding cells point by point according to the pore permeability value of the typical reservoir of the research area, and respectively forming a nuclear magnetic resonance logging T2 spectrum sample library under the water-based drilling fluid environment and the oil-based drilling fluid environment, as shown in figures 5 to 8.
Optionally, a nuclear magnetic resonance experiment in a saturated water state and a high-pressure mercury intrusion experiment are performed on the core sample of each type of reservoir, and a plurality of T2 relaxation times corresponding to the pore size distribution with the largest influence on permeability of each type of reservoir are obtained.
And performing a nuclear magnetic resonance experiment and a high-pressure mercury intrusion experiment on core samples of the four reservoir types in a saturated water state, and acquiring 5 nuclear magnetic T2 relaxation times corresponding to pore size distribution with the largest influence of each reservoir type on permeability, wherein the nuclear magnetic T2 relaxation times represent pore spaces possibly invaded by the filtrate of the oil-based drilling fluid.
Optionally, the T2 relaxation times are selected to be 5, and the 5T 2 relaxation times given by the class i reservoir are 1.5ms, 3.0ms, 10.0ms, 30.0ms and 50.0ms respectively; class II reservoirs were given 5T 2 relaxation times of 4.0ms, 10.0ms, 40.0ms, 60.0ms, 100.0ms, respectively; class III reservoirs were given 5T 2 relaxation times of 10.0ms, 40.0ms, 90.0ms, 220.0ms, 310.0ms, respectively; the 5T 2 relaxation times given for the type iv reservoir are 50.0ms, 120.0ms, 250.0ms, 410.0ms, 1000.0ms, respectively.
Optionally, the given 5T 2 relaxation times, the minimum T2 relaxation time T2min, and the maximum T2 relaxation time T2max for each type of reservoir divide the nmr log T2 spectrum in the oil-based drilling fluid environment into 6 intervals, accumulate the magnitudes of the nmr log T2 spectrum for each interval, and calculate the ratio of the pore component to the total pore component in different intervals, resulting in 6 porosity X components.
For reservoir types in four oil-based drilling fluid environments, the NMR well logging T2 spectrum is corrected by adopting the following method so as to obtain the NMR well logging T2 spectrum in a water-based drilling fluid environment. The nuclear magnetic resonance T2 spectrum is divided into 6 intervals by 7T 2 relaxation times of 5T 2 relaxation times, the minimum nuclear magnetic resonance T2 relaxation time T2min is 0.3ms and the maximum T2 relaxation time T2max is 3000ms which are given to each reservoir type, the nuclear magnetic resonance T2 spectrum amplitude of each interval is accumulated, the proportion of the pore components in different intervals to the total pore components is calculated, and 6 porosity X components are obtained.
Optionally, establishing a multivariate linear function relationship between the amplitudes of the T2 spectrum components of the nmr log in the water-based drilling fluid environment and the 6 porosity X components of the T2 spectrum of the nmr log in the oil-based drilling fluid environment, and calculating the T2 spectrum amplitudes of the nmr log in the water-based drilling fluid environment at different T2 relaxation times from the T2 spectrum of the nmr log in the oil-based drilling fluid environment.
Optionally, the multivariate linear function relationship between the amplitudes of the points constituting the nmr log T2 spectrum in the water-based drilling fluid environment and the 6 porosity X components of the nmr log T2 spectrum in the oil-based drilling fluid environment is:
A1＝a11X1+a12X2+a13X3+a14X4+a15X5+a16X6+b1
A2＝a21X1+a22X2+a23X3+a24X4+a25X5+a26X6+b2
A3＝a31X1+a32X2+a33X3+a34X4+a35X5+a36X6+b3
...
Ai＝ai1X1+ai2X2+ai3X3+ai4X4+ai5X5+ai6X6+bi
in the above formula, AiThe amplitude value corresponding to the ith distribution point of the corrected nuclear magnetic resonance logging T2 spectrum is shown, and the value of i is the distribution point number of the nuclear magnetic resonance logging T2 spectrum; x1,X2......X66 porosity X components partitioned for corresponding reservoir types; a isi1,ai2......ai6The coefficient corresponding to the multivariate linear function corresponding to the ith point is obtained by calibrating the nuclear magnetic resonance logging T2 spectrum data under the water-based drilling fluid environment and the oil-based drilling fluid environment in the sample library; b1,b2......biAnd (3) calibrating the numerical value of a constant coefficient corresponding to the multivariate linear function corresponding to the ith point distribution by using nuclear magnetic resonance logging T2 spectrum data under the water-based drilling fluid environment and the oil-based drilling fluid environment in the sample library.
Optionally, a nuclear magnetic resonance logging T2 spectrum in the corrected water-based drilling fluid environment is drawn according to the calculated nuclear magnetic resonance logging T2 spectrum amplitude and the corresponding T2 relaxation time.
Optionally, a comprehensive interpretation chart is drawn in the logging interpretation platform according to the corrected nuclear magnetic resonance logging T2 spectrum in the water-based drilling fluid environment.
As shown in fig. 9, a corresponding hitching procedure is programmed on the cifog interpretation platform, and a comprehensive interpretation chart for correcting the nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment actually measured in a certain oil and gas field is obtained. The first path in the figure is GR (natural gamma curve), CAL (bore diameter curve) and BIT (drill diameter curve); the second channel is a depth channel; the third is a resistivity curve; the fourth path is a three-porosity curve; the fifth path is an actually measured nuclear magnetic resonance logging T2 spectrum before correction; the sixth step is that the nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment is obtained after the nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment obtained through actual measurement is corrected, and as can be seen from the figure, compared with the nuclear magnetic resonance logging T2 spectrum before correction, the nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment obtained by the method is shifted to the left, the tailing phenomenon disappears, the number of main peaks of the T2 spectrum is changed from double peaks to single peaks, and the influence of the invasion of the oil-based drilling fluid filtrate is eliminated; the seventh path is a nuclear magnetic porosity and core analysis porosity contrast path; the eighth trace is a comparison trace of permeability calculated by nuclear magnetic resonance before and after correction, and it can be seen that, in the environment of oil-based drilling fluid, the permeability result calculated by using a T2 spectrum of nuclear magnetic resonance logging is obviously larger than the permeability of core analysis, the permeability calculated by using a T2 spectrum of nuclear magnetic resonance logging in the environment of water-based drilling fluid obtained after correction becomes smaller, the coincidence effect with the permeability result of core analysis is better, and it can also be seen from fig. 10 that the permeability calculated by using a T2 spectrum of nuclear magnetic resonance logging after correction is better in coincidence effect with the structure of core analysis; the ninth is a lithologic sectional view.
The method for correcting the nuclear magnetic resonance logging T2 spectrum form under the oil-based drilling fluid environment provided by the embodiment establishes a functional relationship between the nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment and the water-based drilling fluid environment on the basis of the nuclear magnetic resonance logging data actually measured under the existing water-based drilling fluid environment and the oil-based drilling fluid environment, corrects the nuclear magnetic resonance logging T2 spectrum form under the oil-based drilling fluid environment, can correct the nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment to the nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment with corresponding depth, performs fluid identification, achieves the purposes of accurately calculating rock physical characteristic parameters and evaluating a reservoir pore structure, and solves the problems that the nuclear magnetic resonance logging T2 spectrum form is obviously changed due to the invasion of oil-based drilling fluid, the rock pore structure cannot be accurately and quantitatively evaluated and the reservoir evaluation parameters cannot be accurately calculated, the correction result is helpful for continuous quantitative evaluation of the pore structure and permeability of the rock according to the T2 spectrum of the nuclear magnetic resonance logging, and the application accuracy of the nuclear magnetic resonance logging data in the oil-based drilling fluid environment is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A nuclear magnetic resonance logging T2 spectrum form correction method under an oil-based drilling fluid environment is characterized by comprising the following steps:
s1, respectively and actually measuring nuclear magnetic resonance logging data of a reservoir layer of a target area in a water-based drilling fluid environment and an oil-based drilling fluid environment, and processing to obtain a nuclear magnetic resonance logging T2 spectrum, a corresponding permeability curve and a corresponding porosity curve in the corresponding environment;
s2, dividing reservoirs into multiple types according to the permeability curve and the porosity curve, capturing actual measured nuclear magnetic resonance logging data of the reservoirs of each type under the water-based drilling fluid environment and the oil-based drilling fluid environment respectively by adopting a two-dimensional grid method, and establishing a functional relation between a nuclear magnetic resonance logging T2 spectrum under the oil-based drilling fluid environment and a nuclear magnetic resonance logging T2 spectrum under the water-based drilling fluid environment;
s3, correcting the nuclear magnetic resonance logging T2 spectrum of each type of reservoir in the oil-based drilling fluid environment to the water-based drilling fluid environment, and further utilizing the corrected nuclear magnetic resonance logging T2 spectrum to continuously and quantitatively evaluate the calculation of the pore size and the permeability of the reservoir in the oil-based drilling fluid environment.
2. The method for correcting the nuclear magnetic resonance logging T2 spectrum morphology in the oil-based drilling fluid environment according to claim 1, wherein the types of reservoirs are divided into four types, the permeability K of the type I reservoir ranges from K <1mD, the permeability K of the type II reservoir ranges from K <10mD to K <1mD, the permeability K of the type III reservoir ranges from K <100mD to K <10mD, and the permeability K of the type IV reservoir ranges from K to K which is not less than 100 mD.
3. The method for correcting the spectrum morphology of the nuclear magnetic resonance logging T2 in the environment of the oil-based drilling fluid according to claim 1, wherein the upper limit and the lower limit of the porosity and the permeability of the reservoir are determined, the porosity and the permeability are divided into a plurality of equal parts between the upper limit and the lower limit, the porosity is taken as an abscissa, the permeability is taken as an ordinate, a two-dimensional grid is obtained, the nuclear magnetic resonance logging T2 spectrum data in the environment of the oil-based drilling fluid and the nuclear magnetic resonance logging T2 spectrum data in the environment of the water-based drilling fluid are divided into corresponding grid units point by point according to the pore permeability value, and a nuclear magnetic resonance logging T2 spectrum sample library in the environment of the water-based drilling fluid and the environment of the.
4. The method for correcting the nuclear magnetic resonance logging T2 spectrum morphology under the environment of the oil-based drilling fluid according to claim 1, wherein a nuclear magnetic resonance experiment in a saturated water state and a high-pressure mercury intrusion experiment are performed on a core sample of each type of reservoir, and a plurality of T2 relaxation times corresponding to pore size distribution with the largest influence of each type of reservoir on permeability are obtained.
5. The method for correcting the nuclear magnetic resonance logging T2 spectrum morphology in the environment of the oil-based drilling fluid according to claim 1, wherein 5T 2 relaxation times are selected, and 5T 2 relaxation times given by the type I reservoir are respectively 1.5ms, 3.0ms, 10.0ms, 30.0ms and 50.0 ms; class II reservoirs were given 5T 2 relaxation times of 4.0ms, 10.0ms, 40.0ms, 60.0ms, 100.0ms, respectively; class III reservoirs were given 5T 2 relaxation times of 10.0ms, 40.0ms, 90.0ms, 220.0ms, 310.0ms, respectively; the 5T 2 relaxation times given for the type iv reservoir are 50.0ms, 120.0ms, 250.0ms, 410.0ms, 1000.0ms, respectively.
6. The method for correcting the spectrum morphology of the nuclear magnetic resonance log T2 in the environment of the oil-based drilling fluid according to claim 1, wherein the given 5T 2 relaxation times, the minimum T2 relaxation time T2min and the maximum T2 relaxation time T2max of each type of reservoir divide the nuclear magnetic resonance log T2 spectrum in the environment of the oil-based drilling fluid into 6 intervals, the amplitudes of the nuclear magnetic resonance log T2 spectrum in each interval are accumulated, and the proportion of the pore components in the different intervals to the total pore components is calculated to obtain 6X components of the porosity.
7. The method for correcting the spectrum morphology of the nuclear magnetic resonance log T2 in the environment of the oil-based drilling fluid according to claim 1, wherein a multivariate linear function relationship between the amplitudes of the points forming the nuclear magnetic resonance log T2 spectrum in the environment of the water-based drilling fluid and the 6 porosity X components of the nuclear magnetic resonance log T2 spectrum in the environment of the oil-based drilling fluid is established, and the amplitudes of the nuclear magnetic resonance log T2 spectrum in the environment of the water-based drilling fluid at different T2 relaxation times are calculated from the nuclear magnetic resonance log T2 spectrum in the environment of the oil-based drilling fluid.
8. The method for correcting the spectrum morphology of the nuclear magnetic resonance log T2 in the environment of the oil-based drilling fluid according to claim 1, wherein the multivariate linear function relationship between the amplitudes of the points of which the nuclear magnetic resonance log T2 spectrum in the environment of the water-based drilling fluid consists and the 6 porosity X components of the nuclear magnetic resonance log T2 spectrum in the environment of the oil-based drilling fluid is as follows:
A1＝a11X1+a12X2+a13X3+a14X4+a15X5+a16X6+b1
A2＝a21X1+a22X2+a23X3+a24X4+a25X5+a26X6+b2
A3＝a31X1+a32X2+a33X3+a34X4+a35X5+a36X6+b3
...
Ai＝ai1X1+ai2X2+ai3X3+ai4X4+ai5X5+ai6X6+bi
in the above formula, AiThe amplitude value corresponding to the ith distribution point of the corrected nuclear magnetic resonance logging T2 spectrum is shown, and the value of i is the distribution point number of the nuclear magnetic resonance logging T2 spectrum; x1,X2......X66 porosity X components partitioned for corresponding reservoir types; a isi1,ai2......ai6The coefficient corresponding to the multivariate linear function corresponding to the ith point is obtained by calibrating the nuclear magnetic resonance logging T2 spectrum data under the water-based drilling fluid environment and the oil-based drilling fluid environment in the sample library; b1,b2......biCorrespond to the ith stationingThe numerical value of the constant coefficient corresponding to the multivariate linear function is obtained by calibrating nuclear magnetic resonance logging T2 spectrum data in a sample library under the environment of water-based drilling fluid and the environment of oil-based drilling fluid.
9. The method for correcting the spectrum morphology of the nuclear magnetic resonance log T2 in the environment of the oil-based drilling fluid according to claim 1, wherein the nuclear magnetic resonance log T2 spectrum in the environment of the water-based drilling fluid after correction is drawn according to the calculated nuclear magnetic resonance log T2 spectrum amplitude and the corresponding T2 relaxation time.
10. The method for correcting the spectrum morphology of the nuclear magnetic resonance logging T2 in the environment of the oil-based drilling fluid according to claim 1, wherein a comprehensive interpretation chart is drawn in a logging interpretation platform according to the corrected nuclear magnetic resonance logging T2 spectrum in the environment of the water-based drilling fluid.
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